Chemical Specifications Appearance Cream to pale yellowish brown colored powder Assay 91 - 106% Identification 'A' & 'B' To comply USP test Loss on drying (at 105°C; 4 hrs) Max 15.0% Arsenic (As) Max 0.00015% Total ash 18-27% Lead (Pb) Max 0.0005% Heavy metal (as Pb) Max 0.004% Viscosity (1% w/w solution; 25°C; on dry basis) 45 cps +/- 2 cps Microbial Limits To comply USP test